Abstract: The pore structure of the surrounding rock along the mineroadway would be an important factor affected to the stability of the surrounding rock along the mine roadway.Based on the investigation on the stability control of the surrounding rock along the mine roadway in Shanxi Coal Transportation and Sales Group, taking the conventional carbonaceous mudstone, sandy mudstone, fine sandstone, medium sandstone and K2 limestone as the study object, a microscope CT non-destructive detection was conducted, the Matlab language was applied to the digital image processing and 3D reconstruction on the microscope CT image of the rock samples and a study was conducted on the pore size, pore rate and other pore structure parameters. The results showed that based on the microscope CT, a new method was provid ed to study the pore structure of the surrounding along the mine roadway.The pore size was ranging from 1.47-11.76 μm and the pore rate of the surrounding rock along the mine roadway would be reduced in a minus index law with the pore size increased.